Leather-board and process of producing the same.



STAES PAENT FFCi ALBERDLQ CLAP, 0F '-BRAINTREE, MASSACHUSETTS, ASSIGNGR T0 HIDEIT MASACHUSETTS, A CORLFGRATION 0F MAINE.

COMPANY, OF BOSTON,

LEATHER-BDAEB LND c EOCESS 0E' PBGDUCING THE SAME,

No Drawing.

T0 all whom it may concern:

Be it known that 1, ALBERTAL. CLAY?, a citizen of the United States, residing ai. Braintree, in the county of Norfoik and State of iinssnchusetisg beve invented certain new and useful improvements in Leaheronrd and Processes of Producing' the Same, of which the foilo'wing is e speciicalbion.

My present invention pertains to en inn proved 1ee'rherboard,`and the process oi producing the same.

he invention has for its object the lutilization of chrome scrap in the production of leather-board, which scrap, owing mainly to the feci that it could not 'De beaten out., has not., so fer as i sin aware, been coms inerciaily used in the producion o ieetherboard. 'With the process hereinafer set forth such scrap may be employed and the benefits iowing from the presence in suoli. scrap of certain chemicals or chemical conipounds taken advantage oi or utilized in the production of the hoard` The. process is es follows: The chrom.: scrap is first passed through a reg-cutter or any other machine which Wiil' nischenicullj;g and in the absence of moisture, cut it up or pertieily disintegrate the same, The chrome. scrap thus treated is inruiuced ino e beater engine along with ordinary scrap, the prolortion used being from two hundred to our hundred pounds of chrome scrap to ebou: one. thousand poundsof the ordinary gunned leather?. reisiive nniounis varying accor ing to the degree of 'waterproofing rege/girati. The 4 v uce a sazisacerv resero.

incisions given Clero! inegi also he added o une ter without the new i iry usintegrniom such. fir-uni y beat out suliir. vzifitlj; Without previous disin tegration. Vilien the heater thus charged, an" interaction evidently te kes place neuve n the chrome seit-s, present in the chrome scrap, and e 1 trannie acid 'pi-senr in th ordinary scrsp, causing in insoiubie co pound ign be precipitated openine iieers the charge This-is indicated. by elle change in color iu the chrome scrap, pissing roin greenish casi eo e'iircwn, due, no doubtthe absorption oi the sannio scid i given of? from the ordinary sors?. '.i evidently produced. ti'irough this i sione a donnie oi chrom-inni und Spcciication of Letters Patent.

Application led 'almary il, i913.

v during the beating Patented Mar. e, 1915;

Serial No. 741,478,

which is en insoluble compound, es Lne product formed according to the present process is rendered'quit-e waterproof.

Ordinariiy chrome leather scrap cannot be successfuily beaten out7 as it becomes slimy and slippery to such an extent that itl viii not, be beaten out by the beater roll, but with the present. process he scrap may be beate-n out to 'the desired pulpy consistency. Apparently; the surface conditions of the chrome scrap are undergoing e constant change, 0W- ing to the chemical reaction, and the surface no longer'presents such a. slippery condition ns will prevent such Wet disintegration as is necessary to reduce it to a pulp of such consistency as to admit of its being formed into :i board. Whatever may he the cause or action, it is found hy actual use that, chrome scrap, when thus manipulated iu a beater Ywill become disintegrated and form a pulp of proper consistency, By preference, alum will be .added to the charge in the beater when the sock is beaten out, or nearly so,

the eluin precipitating more or less o "che soiuiyie umrez'iuls dissoired out of operation. Such matt-er asis thus thrown down xviii be distributed throughout the mass and aids or assistsin milking the stock waterproof, The amount;

of alum used, 'iis 'from fifteen to t reality-(ive pounds 'to he ordinary oesterdund.2 which averages frouilft() 01930 pounds. it will, of course, he understood' that the compounds formed. by the .finter'ction oiz the chromo and ne tannin acid are elsoinsoiuhie render ehe uniss Waterproofio e greater or iess extent. it, will likewise be underinet the procs Y, in so fur nsthe Watersii-eo concerned, is not entirely erfon the interaction of the ssii-s present; in the chrome scrap and tsnuic acid, siucesucn chrome seits es may rcumin in scrap uueiiected by the i cion oi 'ne tennis seid are in and oi themfitenrpeiinni; This assumes, of 't-annic scid is not mese-nt in i 3i te internet with or ccnie cin'ffuno present. lends irseif to the reuse of n es iorth in Letter-s Patent ci' the United Smes No, fli, granted dale oi December 10, ML2, for rfhurged n" `e unt-er is reused present in fne center engine a stock board stock 1o i board In fact, where the tannic acid iszpresent in a. considerable quantity it" is not necessary to grind the chrome scrap to the same extent las where the tannic acid is merely derived from the ordinary tanned scrap. f

Having thus' described my invention, what I claim is:

1.'.The process of producing' "leatherfrom chrome leather, which consists in beating out said leather in the presence of tarinc acid.

2. The

process of producing leatherboard stock from chrome leather, which consists in comminuting said stock whilel dr and subsequently beating out said stock 1n the presence of tannic acid. I

.3. The process` of producing leatherboard stock from chronie leather, which con! sists in comminuting said stock while dry, and subsequently beating out the same in .the presence of ordinary tanned leather, whe'reby the chrome salts will be converted by the action of the tannic acid derived from the ordinary tanned leather andthe whole charge rendered waterproof. f

4. The process of producing leatherstock from chrome tanned leather,

chrome salts which conssts in comminuting such scrap while dry; beating out said comminuted scrap along with a charge of ordinary tanned leather scrap, and finally adding alum to precipitaifthe soluble matters present in the charge, i" l 5. The process of producing leatherboard stock from chrome scrap, which consists in beating up said scrapI in thepresence of a. reagent capable of converting the present in the chrome scrap.

6. The process of beating out chrome leather stock, which consists in comminuting the leather;l placing the comminuted stock in a beaterrand subjecting the same to the action of a reagent which tends to destroy the slick or slimy surface of the stock, whereby the stock may be beaten out by the beater roll.

Inl testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALBERT L.4 CLAPP.

Witnesses:

HORACE A. DODGE, BENNE'rr S. JONES. 

